VAT MTD - Finance System upgrade - Connection to MTD needs refreshing - UREGENT , deadline due

Hi - we upgraded our system and now we can no longer access MTD for our VAT return for quarter ended 30 Sept 2023 - which is now due Any ideas what information I need for this? I am the acting FD of the business, and the system is MS Dynamics NAV (2017) Version GB 10.0 More specifically 10.0.30712.0 Can you help - I just spent 90 minutes on the phone to the VAT helpline and they eventually said try the message boards on the MTD site, so here I am Many thanks

BTW The error message we are getting is HTTP error 408 HMRC server request timed out

Hi,

If you are having issues with connecting up your software to your business tax account we would suggest that you firstly speak to the software provider to rule out any issues their end,

If the problem does not lie with the software then please contact our VAT team again to see if we can diagnose the issue for you.

VAT: general enquiries

Thank you.

Thanks HMRC - we have been trying to fix with our System provider for more than a week. In response to your note above they saidand they said: "Hi Bill, we have checked against other customers and the setup etc is exactly the same. We can’t debug as it will hang as it leaves Nav to use the gateway. It needs reporting to HMRC as we believe the error to be at their end." and that "We will check other connections but it is worth reporting to HMRC in the meantime. We have customers who had similar issues previously" Is there any way you can check from your endwhether our system is connecting properly to yours? Many thanks

Hi.

You will need to contact our VAT team so we can check.

VAT: general enquiries

Thank you.

The issue now resolved - maybe helpful for you or others to note: As it turns out, it seems to be that the admin accounts that were being used on the NAV server were being blocked by our physical firewall for the api.service.hmrc.gov.uk but most sites could get through fine. Our finance system support ( external) needed help from the the external IT support that we were using who has a far better understanding of the physical firewall. This was then unblocked and allowed through the firewall, so NAV can now access the HMRC site as expected. It was a firewall issue.